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-rw-r--r--scheme/geiser/introspection.scm79
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-;; introspection.scm -- name says it all
-
-;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
-
-;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
-;; Start date: Sun Feb 08, 2009 18:44
-
-;; This file is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 3 of the License, or
-;; (at your option) any later version.
-
-;; This file is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-;;; Comentary:
-
-;; Procedures introspecting on scheme objects and their properties.
-
-;;; Code:
-
-(define-module (geiser introspection)
- #:export (proc-args completions)
- #:use-module (system vm program)
- #:use-module (ice-9 session)
- #:use-module (srfi srfi-1))
-
-(define (proc-args proc)
- (let ((proc (and (symbol? proc)
- (module-bound? (current-module) proc)
- (eval proc (current-module)))))
- (cond ((not proc) #f)
- ((program? proc) (program-args proc))
- ((procedure? proc) (procedure-args proc))
- ((macro? proc) (macro-args proc))
- (else #f))))
-
-(define (program-args program)
- (let* ((arity (program-arity program))
- (arg-no (first arity))
- (opt (> (second arity) 0))
- (args (map first (take (program-bindings program) arg-no))))
- (format-args (if opt (drop-right args 1) args)
- (and opt (last args))
- (program-module program))))
-
-(define (procedure-args proc)
- (let* ((arity (procedure-property proc 'arity))
- (req (first arity))
- (opt (third arity))
- (env (procedure-environment proc)))
- (format-args (map (lambda (n)
- (string->symbol (format "arg~A" (+ 1 n))))
- (iota req))
- (and opt 'rest)
- (and (not (null? env)) env))))
-
-(define (macro-args macro)
- (let ((prog (macro-transformer macro)))
- (if prog
- (program-args prog)
- (format-args '(...) #f #f))))
-
-(define (format-args args opt module)
- (list (cons 'required args)
- (cons 'optional (or opt '()))
- (cons 'module (if module (module-name module) '()))))
-
-(define (completions prefix)
- (sort! (map symbol->string
- (apropos-internal (string-append "^" prefix)))
- string<?))
-
-;;; introspection.scm ends here